US3907939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphite esters of hindered phenols
Assignee: Ashland LLC
•
Filing: 1969-06-16
•
Granted: 1975-09-23
•
Expires: 1989-06-16
Abstract
Abstract Reaction products of a phosphite ester-forming compound such as a phosphorous trihalide and a hindered bis phenol are obtained. Such products are useful as antioxidants in various compositions and materials.
Inventors
- 👤 Michael Robin
- 👤 Sheldon R Schulte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:09
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/145; C07F9/09; C07F9/12; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65744; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524; C08K5/526
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
6 words
A PHOSPHITE ESTER OF THE FORMULA:
Claim 2
Dependent Claim
6 words
A PHOSPHITE ESTER OF THE FORMULA:
Claim 3
Dependent Claim
20 words
A phosphite ester in accordance with claim 1 wherein RI and RII are alkyls of 1 to 12 carbon atoms.
Claim 4
Dependent Claim
20 words
A phosphite ester in accordance with claim 2 wherein the R is an alkylene of 1 to 4 carbon atoms.
Claim 5
Dependent Claim
19 words
A phosphite ester in accordance with claim 3 wherein the OH group on each ring is ortho to R.
Claim 6
Dependent Claim
25 words
A phosphite ester in accordance with claim 4 wherein RI is ortho to the OH group on each ring and is a tertiary butyl group.
Claim 7
Dependent Claim
12 words
A phosphite ester in accordance with claim 5 wherein R is methylene.
Claim 8
Dependent Claim
6 words
A phosphite ester of the formula
Claim 9
Dependent Claim
6 words
A phosphite ester of the formula
Claim 10
Dependent Claim
4 words
Tris ( 2(2-hydroxy-3-t-butyl-5-methylbenzyl)-4-methyl-6-t-butylphenyl) phosphite.
Claim 11
Dependent Claim
4 words
Tris ( 2(2-hydroxy-3-t-butyl-5-methylbenzyl)-4-methyl-6-t-butylphenyl) phosphite.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |